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7
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Piping installation
7.2.3 Guidelines when connecting the refrigerant piping
7.2.4 To connect the refrigerant piping to the indoor unit
Installer reference guide
24
▪
When brazing, blow through with nitrogen to prevent creation of large quantities
of oxidized film on the inside of the piping. This film adversely affects valves and
compressors in the refrigerating system and prevents proper operation.
▪
Set the nitrogen pressure to 20 kPa (0.2 bar) (just enough so it can be felt on the
skin) with a pressure-reducing valve.
a
b
f
a Refrigerant piping
b Part to be brazed
c Taping
d Manual valve
e Pressure-reducing valve
f Nitrogen
▪
Do NOT use anti-oxidants when brazing pipe joints.
Residue can clog pipes and break equipment.
▪
Do NOT use flux when brazing copper-to-copper refrigerant piping. Use phosphor
copper brazing filler alloy (CuP279, CuP281, or CuP284:DIN EN ISO 17672), which
does not require flux.
Flux has an extremely harmful influence on refrigerant piping systems. E.g., if a
chlorine-based flux is used, it will cause pipe corrosion or, in particular, if the flux
contains fluorine, it will deteriorate the refrigerant oil.
▪
Always protect the surrounding surfaces (e.g. using insulation foam) against heat
when brazing.
CAUTION
Install the refrigerant piping or components in a position where they are unlikely to
be exposed to any substance which may corrode components containing refrigerant,
unless the components are constructed of materials that are inherently resistant to
corrosion or are suitably protected against corrosion.
▪
Pipe length. Keep refrigerant piping as short as possible
▪
Connection example to the indoor unit:
a
a Outdoor unit
b BEV2 unit
c Gas piping
d Liquid piping
e Indoor unit
INFORMATION
▪
Only 1 indoor unit may be connected to each BEV2 unit.
▪
This chapter describes only the connection procedure to the BEV2 unit. For the
connection procedure of the indoor or outdoor unit, refer to the installation
manual of the indoor or outdoor unit.
c
d
e
f
c
d
b
e
CO₂ Conveni-Pack: BEV2 unit
4P677928-1 – 2021.10
BEV2N-A
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